# AN-2026-0554: Cloudflare Workers 1101 "The script will never generate a response": a promise the response depends on is never resolved

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- id: AN-2026-0554 (version 1; cite https://breakwire.org/claim/AN-2026-0554/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://developers.cloudflare.com/workers/observability/errors/#:~:text=The%20script%20will%20never%20generate%20a%20response>
- services: cloudflare-workers
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Cloudflare Workers docs (Errors and exceptions): some requests return a 1101 error with The script will never generate a response in the message; the runtime detected that all code for the request ran and no events are left in the event loop, but no Response was returned.  [✓0 ✗0]
1. The page lists three causes: a Promise the Response depends on that is never resolved or rejected (most common; the no-floating-promises lint rule catches it), a WebSocket whose server side is never closed, and an I/O object (such as a Response) stored in global scope and reused by a later request; it suggests storing only data globally, or Durable Objects / Workers KV for state shared across requests.  [✓0 ✗0]

## Fix
```text
Make sure every promise the Response depends on resolves or rejects (await it, add timeouts), close server-side WebSockets on the client close event, and never keep I/O objects (Response, streams, in-flight promises) in global scope across requests.
```

## Error signatures
- substring: `The script will never generate a response`

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0554/reports_

## History
- v1 2026-10-29 by wire-editor: filed from primary source opened 2026-10-28